CN100457318C - Plate type wedge lateral rolling forming method for eccentric step shalf - Google Patents

Abstract

The present invention provides a kind of plate type wedge rolling forming method for eccentric stepped shaft, and belongs to the field of plastic metal forming technology. The forming method includes moving two plate type molds with wedge mold face to face, and extruding heated circular rod in the molds for continuous radial compression and axial extending deformation to become eccentric stepped shaft gradually. The mold for forming eccentric circular shaft section has wedge work surface comprising inclined wedge surface and mold top surface, and curved top surface, with the curved surface being one corrugate envelope surface formed by the corrugate motion of the eccentric rolled workpiece circle and the mold top surface during the rolling process. The present invention has the advantages of high production efficiency, high material utilizing rate, low production cost, high size precision and high product quality, and realizes the precise formation of eccentric stepped shaft.

Description

The plate-type wedge rolling manufacturing process of eccentric stepped shaft

Technical field:

The invention belongs to the metal forming technical field, a kind of plate-type wedge rolling manufacturing process of eccentric stepped shaft is provided especially.

Technical background:

Cross wedge rolling is a kind of axial workpiece New Forming Process, and its operation principle is: the board-like moulds of two band wedge shape moulds, move in the opposite direction, drive circular rolled piece reverse rotation, rolled piece under the effect of wedge shape pass, the various multidiameters of roll forming.Its main distortion is that radial compression extends axially.This technology is mainly used in the big axial workpiece of production lot, comprising: the axial workpiece on automobile, tractor, motorcycle, internal combustion engine, hardware ﹠ tools, building machinery, the electric armour clamp etc.Characteristics such as this technology has efficiently, material-saving, low consumption are the advanced production technologies of saving metal material and energy.But traditional cross wedge rolling can only be produced various concentric revolving body axial workpieces, and eccentric axial workpiece can't be shaped.The invention solves the difficult problem of traditional cross wedge rolling, realized the production of eccentric stepped shaft cross wedge rolling, enlarged the scope of application of cross wedge rolling technique, improve stock utilization, reduce cost, further realized the nearly clean roll forming of cross wedge rolling.

Summary of the invention:

The object of the present invention is to provide a kind of plate-type wedge rolling manufacturing process of eccentric stepped shaft, produce various eccentric stepped shafts (referring to Fig. 1) with the plastic molding method of high efficiency, low energy consumption, high material-saving rate.

Of the present invention constituting: two board-like moulds that have the wedge type mould are done moving movement in opposite directions, the metal circular bar of heating is done gyration under die wedge sidewall and end face effect, realize continuous radial compression, extend axially distortion, being shaped gradually comprises each step (referring to Fig. 2 and Fig. 3) of off-centre operation.Each method and traditional cross wedge rolling with concentric circles step shaft part that be shaped is identical.The pairing mould wedge of shaping off-centre operation shaft part working face is formed (referring to Fig. 4) by die wedge face and die top.Forming angle α=16 of die wedge face °～45 °, the forming angle of cammed surface can be 1 (referring to Fig. 5), also can constitute (referring to Fig. 6) by 2～10 forming angles, also can be by curved surface, for example arcwall face constitutes (referring to Fig. 7); Broadening angle β=1 °～15 °, the broadening angle of cammed surface also can be made of the broadening angle of 1～10 angle changing.

The pairing die top of shaping off-centre operation shaft part is a curved surface, and this curved surface is that the rolled piece off-centre operation is made the relative determined enveloping surface (referring to Fig. 8) of gripping altogether of movement relation of gripping altogether with die top in the operation of rolling.As the rolling rolling radius r of rolled piece _kDuring for certain value, its equation determines that method is as follows:

1) movement locus at first definite off-centre operation center of circle.

The movement locus Γ in the off-centre operation center of circle is the near sinusoidal curve when rolling, and its equation can be expressed as:

$\mathrm{\Γ}:y=e\·\cos \frac{x}{r_k}$

In the formula: e is the offset of off-centre operation; r _kBe the rolling rolling radius of rolled piece.

As rolling rolling radius r _kDuring for constant, the die top bus is the sine curve of standard.In the actual process, rolling rolling radius r _kIn less certain limit, be vicissitudinous, so the die top bus is near sinusoidal curve (referring to Fig. 8).

2) die top equation

A radius is the circle of r (off-centre operation radius), and its center of circle is when the movement locus Γ in the off-centre operation center of circle moves, and { Sc}, die top are the family of surfaces { enveloping surface of Sc} (referring to Fig. 8) promptly to obtain a family of surfaces.Two die top shapes are not exclusively the same when it should be noted that rolling off-centre operation, its end face equation phase difference of half cycle.Therefore, as rolling rolling radius r _kWhen being a constant, its die top equation can be expressed as:

In the formula:

Wherein γ=0 and γ=π

The cross wedge rolling forming method of eccentric stepped shaft of the present invention is applicable to plate-type wedge rolling or chain-plate type cross wedge rolling.

The eccentric stepped shaft of indication can include 1～16 eccentric diameter of axle section in the cross wedge rolling forming method of eccentric stepped shaft of the present invention.

The invention has the advantages that:

Compare the present invention with the forging and molding mode and have following advantage:

1) production efficiency is high 3～10 times;

2) service load descends weight of equipment less than 10% significantly, and increase substantially die life;

3) formation of parts precision height does not have overlap, and the material-saving rate can realize few nothing cutting and part Accurate Shaping more than 20%;

4) the part fibre flow of Cheng Xinging is continuous, and can realize deformation process, and part quality is good;

Do not have when 5) working and impact few noise, easily be automated production, belong to cleaner production etc.

Compare the present invention with traditional cross wedge rolling method and have following advantage:

1) enlarges the cross wedge rolling range of application, realize the production of the cross wedge rolling part of non-revolved body;

2) improve stock utilization.Owing to can directly roll out eccentric shaft, workpiece measurement is realized near-net-shape more near the final products size, has improved stock utilization;

3) reduce the machining expense.Because workpiece measurement is more near the final products size, amount of machining significantly reduces, even directly grinding gets final product, and obviously reduces the machining expense.

4) good product quality, because eccentric shaft is roll forming, the densification of eccentric shaft textura epidermoidea, fibr tissue is continuous, so mechanical performance is improved.

Description of drawings:

Fig. 1 is eccentric circular shaft diagram.

Fig. 2 is the front view of plate-type wedge rolling shaping off-centre operation schematic diagram of the present invention, and wherein 5 is bed die, and 6 is rolled piece.

Fig. 3 is the side view of plate-type wedge rolling shaping off-centre operation schematic diagram of the present invention, and wherein 5 is bed die, and 7 is mold, and 8 is the end face of mould, and 9 is the basal plane of mould.

Fig. 4 is the plate-type wedge rolling of the present invention eccentric circular shaft mould wedge type that is shaped, and wherein 10 is die top, and 11 is the die wedge face.

Fig. 5 is single forming angle schematic diagram.

Fig. 6 is many forming angles schematic diagram.

Fig. 7 is the arc schematic diagram for many forming faces.

Fig. 8 is the plate-type wedge rolling of the present invention eccentric circular shaft die top profile diagram that is shaped, wherein, and mold end face outline line 1, die top outline line 2, rolled piece concentric circles center of circle movement locus 3, rolled piece off-centre operation center of circle movement locus 4.

Fig. 9 is the be shaped exemplary shaft of eccentric stepped shaft of the present invention

Figure 10 is the mould pass and the forming process thereof of plate-type wedge rolling shaping eccentric stepped shaft.

The specific embodiment

Shown in Figure 10 is the mould pass figure of plate-type wedge rolling shaping example eccentric shaft (Fig. 9) and the roll forming process schematic diagram of eccentric shaft.Blank places between two moulds, and the mould motion drives the blank rotation, and blank is under mould action, and radial compression extends axially, and blank is configured as multidiameter gradually.The I section die is a Φ 30mm section at the mid diameter of shaping eccentric shaft; The II section die is a Φ 33mm section at the eccentric shaft diameter of shaping eccentric shaft; This stage is shaped and is different from traditional cross wedge rolling, is key point of the present invention, is the stage of shaping eccentric shaft, and its longitudinal sectional drawing is shown in Figure 10 (V-V), and the pairing mould wedge type of this this section eccentric shaft that is shaped as shown in Figure 4.The III section die is a Φ 25mm section in the outermost diameter of shaping eccentric shaft; The IV section die is shaping and cuts off stub bar.

Claims (5)

1. A plate type cross wedge rolling forming method of an eccentric stepped shaft, characterized in that: two plate molds with wedge molds move towards each other, and the heated metal circular bar acts on the mold wedge side wall and top surface Next, realize continuous radial compression, axial extension deformation, and gradually form an eccentric stepped shaft; the mold wedge working surface corresponding to the forming eccentric circular shaft section is composed of the mold wedge surface and the mold top surface; the forming eccentric circular shaft section corresponds to The top surface of the mold is a curved surface, which is the conjugate envelope surface determined by the relative conjugate motion between the eccentric circle of the rolled piece and the top surface of the mold during the rolling process. When the rolling radius r _k of the rolled piece is a certain value , its equation can be expressed as:

In the formula: where γ=0 and γ=π 2. According to the method described in claim 1, it is characterized in that: the forming angle of the mold wedge is a forming angle of a single fixed angle, or is composed of 2 to 10 forming angles with varying angles, and the value range of the forming angle is 16° ~45°, or the forming angle of the mold wedge is formed by an arc with a continuously changing tangent angle. 3. The method according to claim 1, characterized in that: the widening angle of the mold wedge is a single fixed angle widening angle, or consists of 2 to 10 or even more widening angles with varying angles, and the widening angle ranges It is 1°～15°. 4. The method according to claim 1, characterized in that: the cross wedge rolling forming method of the eccentric stepped shaft is suitable for plate type cross wedge rolling or chain plate type cross wedge rolling. 5. The method according to claim 1, characterized in that: the eccentric stepped shaft referred to in the cross wedge rolling forming method of the eccentric stepped shaft includes 1 to 16 eccentric shaft diameter segments.

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